#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main() {
    int n;
    int count = 0;
    scanf("%d", &n);
    while (1)
    {
        if (n % 2 == 0)
        {
            n = n / 2;
            count++;
        }
        else {
            n = n * 3 + 1;
            count++;
        }
        if (n == 1)
        {
            break;
        }

    }
    printf("%d", count);
    return 0;
}